Abstract Background The wide range of clinical presentations of acute coronary syndrome (ACS) makes it indispensible to use tools for risk stratification and for appropriate risks management; thus, the use of prognosis scores is recommended in the immediat clinical decision-making. Objective To validate the Global Registry of Acute Coronary Events (GRACE) score as a predictor of in-hospital and 6-month post-discharge mortality in a population diagnosed with ACS. Methods This is a prospective cohort study of consecutive patients diagnosed with ACS between May and December 2018. GRACE scores were calculated, as well as their predictive value for in-hospital and 6-month post-discharge mortality. The validity of the model was assessed by two techniques: discriminative power using the area under the receiver operating characteristic curve (AUC) and goodness-of-fit, using the Hosmer-Lemeshow (HL) test, at the 5% level of significance. Results A total of 160 patients were included, mean age 64 (±10.9) years; of which 60% were men. The risk model showed to have satisfactory ability to predict both in-hospital mortality, with an area under the curve (AUC) of 0.76 (95% confidence interval [CI], 0.57-0.95; p = 0.014), and 6-month post-discharge mortality, with AUC of 0.78 (95%CI, 0.62-0.94), p = 0.002. The HL test indicated good-fit for both models of the GRACE score. Conclusion In this study, the GRACE risk score for predicting mortality was appropriately validated in patients with ACS, with good discriminative power and goodness-of-fit. The results suggest that the GRACE score is appropriate for clinical use in our setting.

INTRODUÇÃO: Embora a abordagem transradial tenha reduzido as complicações vasculares, estudos demonstram que pode estar relacionada a maior exposição radiológica. É objetivo deste estudo comparar os parâmetros de exposição radiológica em procedimentos cardiológicos invasivos pelos acessos radial e femoral. MÉTODOS: Estudo de coorte prospectiva incluindo pacientes submetidos a cateterismo cardíaco diagnóstico ou intervenção coronária percutânea (ICP) entre agosto de 2010 e dezembro de 2011. Características clínicas, angiográficas e de exposição à radiação foram registradas em banco de dados específico. Os pacientes foram analisados de acordo com a via de acesso: femoral ou radial. RESULTADOS: Foram incluídos 1.197 pacientes, 782 submetidos a procedimentos por via femoral e 415, a procedimentos por via radial. Observou-se menor prevalência de pacientes do sexo feminino (36,2% vs. 45,6%; P < 0,01), cirurgia de revascularização miocárdica prévia (4% vs. 12,7%; P < 0,01) e valvulopatia grave (0,3% vs. 1,4%; P = 0,07) no grupo radial. A mediana da dose de radiação recebida pelos pacientes foi maior com a utilização da via radial, tanto para procedimentos diagnósticos (621,6 mGy vs. 445,7 mGy; P < 0,01) como terapêuticos (1.241,6 mGy vs. 990,9 mGy; P < 0,01). Operadores menos experientes no acesso radial expuseram pacientes a maior dose de radiação nas ICPs (1.463 mGy vs. 1.196 mGy; P = 0,02), o que não ocorreu com os mais experientes (1.311 mGy vs. 1.449 mGy; P = 0,84). CONCLUSÕES: Pacientes submetidos a procedimentos cardiológicos invasivos são expostos a níveis maiores de radiação pela via de acesso radial. No entanto, operadores experientes podem neutralizar essa desvantagem em relação à via femoral.

BACKGROUND: Although the transradial approach had significantly reduced vascular complications, studies have demonstrated that it may be related to higher radiation exposure. The objective of this study is to compare radiation exposure in invasive cardiologic procedures using the transradial and transfemoral approaches. METHODS: Prospective cohort study including patients undergoing diagnostic cardiac catheterization or percutaneous coronary intervention (PCI) between August 2010 and December 2011. Clinical, angiographic and radiation exposure characteristics were recorded in a dedicated database. Patients were analyzed according to the access route: femoral or radial. RESULTS: Of the 1,197 patients included in the study, 782 were submitted to procedures using the femoral access and 415 using the radial access. There was a lower prevalence of females (36.2% vs. 45.6%; P < 0.01), previous coronary artery bypass graft surgery (4% vs. 12.7%; P < 0.01) and severe valvular heart disease (0.3% vs. 1.4%; P = 0.07) in the radial group. The median radiation dose received by the patients was higher with the radial approach, both for diagnostic (621.6 mGy vs 445.7 mGy; P < 0.01) and therapeutic procedures (1,241.6 mGy vs 990.9 mGy; P < 0.01). Less experienced operators in the radial approach exposed patients to higher radiation doses (1,463 mGy vs 1,196 mGy; P = 0.02), which did not occur with the more experienced operators (1,311 mGy vs 1,449 mGy; P = 0.84). CONCLUSIONS: Patients undergoing invasive cardiologic procedures are exposed to higher radiation levels when the radial access is used. However, experienced operators may neutralize this disadvantage.

INTRODUÇÃO: A intervenção coronária percutânea (ICP) primária é o principal método de reperfusão em pacientes com infarto do miocárdio com supradesnivelamento do segmento ST (IAMCSST). A trombectomia por aspiração manual tem sido cada vez mais utilizada e possibilita a análise dos trombos aspirados. MÉTODOS: Pacientes consecutivos submetidos a ICP primária foram incluídos no período de dezembro de 2009 a junho de 2011. As características clínicas e laboratoriais e os dados angiográficos foram coletados prospectivamente e incluídos em banco de dados dedicado. A decisão de realizar tromboaspiração ficou a cargo dos operadores. Foram coletadas 112 amostras de trombos, armazenadas em formalina 10%, fixadas em parafina, coradas com hematoxilina-eosina, e analisadas por microscopia óptica. Na avaliação histopatológica, os trombos foram classificados em trombos recentes ou lisados/organizados. RESULTADOS: Foram identificados trombos recentes em 68 pacientes (61%) e trombos lisados/organizados em 44 pacientes (39%). Os pacientes com trombos recentes apresentaram maior infiltração de glóbulos vermelhos (P = 0,03). Não foram identificadas outras diferenças estatisticamente significantes em relação às características clínicas, angiográficas e laboratoriais ou aos desfechos clínicos entre os dois grupos estudados. CONCLUSÕES: Em pacientes com IAMCSST submetidos a ICP primária, dois terços dos trombos aspirados apresentaram características histopatológicas de trombos recentes. Não foram observadas associações significativas entre essas características e aspectos clínicos, laboratoriais e angiográficos nesta amostra contemporânea e representativa do mundo real.

BACKGROUND: Primary percutaneous coronary intervention (primary PCI) is the preferred reperfusion method in patients with ST-segment elevation myocardial infarction (STEMI). Manual aspiration thrombectomy has been increasingly used and enables the analysis of thrombus aspirates. METHODS: Consecutive patients undergoing primary PCI were enrolled from December 2009 to June 2011. Clinical, laboratory and angiographic data were prospectively collected and entered in a dedicated database. The decision to perform thromboaspiration was left to the discretion of the operators. One hundred and twelve samples of thrombi were collected, stored in 10% formalin-fixed paraffin, stained with hematoxylin-eosin and analyzed by light microscopy. On histopathological evaluation, the thrombi were classified as recent thrombi or lysed/organized thrombi. RESULTS: Recent thrombi were identified in 68 patients (61%) and lysed/organized thrombi in 44 patients (39%). Patients with recent thrombi had higher red blood cell infiltration (P = 0.03). There were no other statistically significant differences identified for clinical, angiographic, laboratory or clinical outcomes between the two study groups. CONCLUSIONS: In patients with STEMI undergoing primary PCI, two-thirds of thrombus aspirates showed histopathological features of recent thrombi. There were no significant associations between these characteristics and clinical, laboratory and angiographic data in this contemporary sample representative of the real world.